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    *
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
    * with the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
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  package org.apache.hadoop.hbase;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.assertNull;
  import static org.junit.Assert.assertTrue;
  import static org.junit.Assert.fail;
  
  import java.io.IOException;
  import java.util.Set;
  import java.util.concurrent.Callable;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.hadoop.fs.FileSystem;
  import org.apache.hadoop.fs.Path;
  import org.apache.hadoop.hbase.client.Admin;
  import org.apache.hadoop.hbase.client.Get;
  import org.apache.hadoop.hbase.client.HTable;
  import org.apache.hadoop.hbase.client.Put;
  import org.apache.hadoop.hbase.client.Table;
  import org.apache.hadoop.hbase.master.HMaster;
  import org.apache.hadoop.hbase.testclassification.MediumTests;
  import org.apache.hadoop.hbase.util.Bytes;
  import org.apache.hadoop.hbase.util.FSUtils;
  import org.apache.hadoop.hbase.zookeeper.ZKUtil;
  import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;
  import org.junit.AfterClass;
  import org.junit.Assert;
  import org.junit.Before;
  import org.junit.BeforeClass;
  import org.junit.Ignore;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  
  import com.google.common.collect.Sets;
  
  @Category(MediumTests.class)
  public class TestNamespace {
    private static final Log LOG = LogFactory.getLog(TestNamespace.class);
    private static HMaster master;
    protected final static int NUM_SLAVES_BASE = 4;
    private static HBaseTestingUtility TEST_UTIL;
    protected static Admin admin;
    protected static HBaseCluster cluster;
    private static ZKNamespaceManager zkNamespaceManager;
    private String prefix = "TestNamespace";
  
  
    @BeforeClass
    public static void setUp() throws Exception {
      TEST_UTIL = new HBaseTestingUtility();
      TEST_UTIL.startMiniCluster(NUM_SLAVES_BASE);
      admin = TEST_UTIL.getHBaseAdmin();
      cluster = TEST_UTIL.getHBaseCluster();
      master = ((MiniHBaseCluster)cluster).getMaster();
      zkNamespaceManager =
          new ZKNamespaceManager(master.getZooKeeper());
      zkNamespaceManager.start();
      LOG.info("Done initializing cluster");
    }
  
    @AfterClass
    public static void tearDown() throws Exception {
      TEST_UTIL.shutdownMiniCluster();
    }
  
    @Before
    public void beforeMethod() throws IOException {
      for (HTableDescriptor desc : admin.listTables(prefix+".*")) {
        admin.disableTable(desc.getTableName());
        admin.deleteTable(desc.getTableName());
      }
      for (NamespaceDescriptor ns : admin.listNamespaceDescriptors()) {
        if (ns.getName().startsWith(prefix)) {
          admin.deleteNamespace(ns.getName());
        }
      }
    }
  
   @Test
   public void verifyReservedNS() throws IOException {
     //verify existence of reserved namespaces
     NamespaceDescriptor ns =
         admin.getNamespaceDescriptor(NamespaceDescriptor.DEFAULT_NAMESPACE.getName());
     assertNotNull(ns);
     assertEquals(ns.getName(), NamespaceDescriptor.DEFAULT_NAMESPACE.getName());
     assertNotNull(zkNamespaceManager.get(NamespaceDescriptor.DEFAULT_NAMESPACE_NAME_STR));
 
     ns = admin.getNamespaceDescriptor(NamespaceDescriptor.SYSTEM_NAMESPACE.getName());
     assertNotNull(ns);
     assertEquals(ns.getName(), NamespaceDescriptor.SYSTEM_NAMESPACE.getName());
     assertNotNull(zkNamespaceManager.get(NamespaceDescriptor.SYSTEM_NAMESPACE_NAME_STR));
 
     assertEquals(2, admin.listNamespaces().length);
     assertEquals(2, admin.listNamespaceDescriptors().length);
 
     //verify existence of system tables
     Set<TableName> systemTables = Sets.newHashSet(
         TableName.META_TABLE_NAME,
         TableName.NAMESPACE_TABLE_NAME);
     HTableDescriptor[] descs =
         admin.listTableDescriptorsByNamespace(NamespaceDescriptor.SYSTEM_NAMESPACE.getName());
     assertEquals(systemTables.size(), descs.length);
     for (HTableDescriptor desc : descs) {
       assertTrue(systemTables.contains(desc.getTableName()));
     }
     //verify system tables aren't listed
     assertEquals(0, admin.listTables().length);
 
     //Try creating default and system namespaces.
     boolean exceptionCaught = false;
     try {
       admin.createNamespace(NamespaceDescriptor.DEFAULT_NAMESPACE);
     } catch (IOException exp) {
       LOG.warn(exp);
       exceptionCaught = true;
     } finally {
       assertTrue(exceptionCaught);
     }
 
     exceptionCaught = false;
     try {
       admin.createNamespace(NamespaceDescriptor.SYSTEM_NAMESPACE);
     } catch (IOException exp) {
       LOG.warn(exp);
       exceptionCaught = true;
     } finally {
       assertTrue(exceptionCaught);
     }
   }
 
   @Test
   public void testDeleteReservedNS() throws Exception {
     boolean exceptionCaught = false;
     try {
       admin.deleteNamespace(NamespaceDescriptor.DEFAULT_NAMESPACE_NAME_STR);
     } catch (IOException exp) {
       LOG.warn(exp);
       exceptionCaught = true;
     } finally {
       assertTrue(exceptionCaught);
     }
 
     try {
       admin.deleteNamespace(NamespaceDescriptor.SYSTEM_NAMESPACE_NAME_STR);
     } catch (IOException exp) {
       LOG.warn(exp);
       exceptionCaught = true;
     } finally {
       assertTrue(exceptionCaught);
     }
   }
 
   @Test
   public void createRemoveTest() throws Exception {
     String testName = "createRemoveTest";
     String nsName = prefix+"_"+testName;
     LOG.info(testName);
 
     //create namespace and verify
     admin.createNamespace(NamespaceDescriptor.create(nsName).build());
     assertEquals(3, admin.listNamespaces().length);
     assertEquals(3, admin.listNamespaceDescriptors().length);
     TEST_UTIL.waitFor(60000, new Waiter.Predicate<Exception>() {
       @Override
       public boolean evaluate() throws Exception {
         return zkNamespaceManager.list().size() == 3;
       }
     });
     assertNotNull(zkNamespaceManager.get(nsName));
     //remove namespace and verify
     admin.deleteNamespace(nsName);
     assertEquals(2, admin.listNamespaces().length);
     assertEquals(2, admin.listNamespaceDescriptors().length);
     assertEquals(2, zkNamespaceManager.list().size());
     assertNull(zkNamespaceManager.get(nsName));
   }
 
   @Test
   public void createDoubleTest() throws IOException, InterruptedException {
     String testName = "createDoubleTest";
     String nsName = prefix+"_"+testName;
     LOG.info(testName);
 
     TableName tableName = TableName.valueOf("my_table");
     TableName tableNameFoo = TableName.valueOf(nsName+":my_table");
     //create namespace and verify
     admin.createNamespace(NamespaceDescriptor.create(nsName).build());
     TEST_UTIL.createTable(tableName, Bytes.toBytes(nsName));
     TEST_UTIL.createTable(tableNameFoo,Bytes.toBytes(nsName));
     assertEquals(2, admin.listTables().length);
     assertNotNull(admin
         .getTableDescriptor(tableName));
     assertNotNull(admin
         .getTableDescriptor(tableNameFoo));
     //remove namespace and verify
     admin.disableTable(tableName);
     admin.deleteTable(tableName);
     assertEquals(1, admin.listTables().length);
   }
 
   @Test
   public void createTableTest() throws IOException, InterruptedException {
     String testName = "createTableTest";
     String nsName = prefix+"_"+testName;
     LOG.info(testName);
 
     HTableDescriptor desc = new HTableDescriptor(TableName.valueOf(nsName+":my_table"));
     HColumnDescriptor colDesc = new HColumnDescriptor("my_cf");
     desc.addFamily(colDesc);
     try {
       admin.createTable(desc);
       fail("Expected no namespace exists exception");
     } catch (NamespaceNotFoundException ex) {
     }
     //create table and in new namespace
     admin.createNamespace(NamespaceDescriptor.create(nsName).build());
     admin.createTable(desc);
     TEST_UTIL.waitTableAvailable(desc.getTableName().getName(), 10000);
     FileSystem fs = FileSystem.get(TEST_UTIL.getConfiguration());
     assertTrue(fs.exists(
         new Path(master.getMasterFileSystem().getRootDir(),
             new Path(HConstants.BASE_NAMESPACE_DIR,
                 new Path(nsName, desc.getTableName().getQualifierAsString())))));
     assertEquals(1, admin.listTables().length);
 
     //verify non-empty namespace can't be removed
     try {
       admin.deleteNamespace(nsName);
       fail("Expected non-empty namespace constraint exception");
     } catch (Exception ex) {
       LOG.info("Caught expected exception: " + ex);
     }
 
     //sanity check try to write and read from table
     Table table = new HTable(TEST_UTIL.getConfiguration(), desc.getTableName());
     Put p = new Put(Bytes.toBytes("row1"));
     p.add(Bytes.toBytes("my_cf"),Bytes.toBytes("my_col"),Bytes.toBytes("value1"));
     table.put(p);
     //flush and read from disk to make sure directory changes are working
     admin.flush(desc.getTableName());
     Get g = new Get(Bytes.toBytes("row1"));
     assertTrue(table.exists(g));
 
     //normal case of removing namespace
     TEST_UTIL.deleteTable(desc.getTableName());
     admin.deleteNamespace(nsName);
   }
 
   @Test
   public void createTableInDefaultNamespace() throws Exception {
     HTableDescriptor desc = new HTableDescriptor(TableName.valueOf("default_table"));
     HColumnDescriptor colDesc = new HColumnDescriptor("cf1");
     desc.addFamily(colDesc);
     admin.createTable(desc);
     assertTrue(admin.listTables().length == 1);
     admin.disableTable(desc.getTableName());
     admin.deleteTable(desc.getTableName());
   }
 
   @Test
   public void createTableInSystemNamespace() throws Exception {
     TableName tableName = TableName.valueOf("hbase:createTableInSystemNamespace");
     HTableDescriptor desc = new HTableDescriptor(tableName);
     HColumnDescriptor colDesc = new HColumnDescriptor("cf1");
     desc.addFamily(colDesc);
     admin.createTable(desc);
     assertEquals(0, admin.listTables().length);
     assertTrue(admin.tableExists(tableName));
     admin.disableTable(desc.getTableName());
     admin.deleteTable(desc.getTableName());
   }
 
   @Test(timeout = 60000)
   public void testNamespaceOperations() throws IOException {
     admin.createNamespace(NamespaceDescriptor.create(prefix + "ns1").build());
     admin.createNamespace(NamespaceDescriptor.create(prefix + "ns2").build());
 
     // create namespace that already exists
     runWithExpectedException(new Callable<Void>() {
       @Override
       public Void call() throws Exception {
         admin.createNamespace(NamespaceDescriptor.create(prefix + "ns1").build());
         return null;
       }
     }, NamespaceExistException.class);
 
     // create a table in non-existing namespace
     runWithExpectedException(new Callable<Void>() {
       @Override
       public Void call() throws Exception {
         HTableDescriptor htd = new HTableDescriptor(TableName.valueOf("non_existing_namespace", "table1"));
         htd.addFamily(new HColumnDescriptor("family1"));
         admin.createTable(htd);
         return null;
       }
     }, NamespaceNotFoundException.class);
 
     // get descriptor for existing namespace
     admin.getNamespaceDescriptor(prefix + "ns1");
 
     // get descriptor for non-existing namespace
     runWithExpectedException(new Callable<NamespaceDescriptor>() {
       @Override
       public NamespaceDescriptor call() throws Exception {
         return admin.getNamespaceDescriptor("non_existing_namespace");
       }
     }, NamespaceNotFoundException.class);
 
     // delete descriptor for existing namespace
     admin.deleteNamespace(prefix + "ns2");
 
     // delete descriptor for non-existing namespace
     runWithExpectedException(new Callable<Void>() {
       @Override
       public Void call() throws Exception {
         admin.deleteNamespace("non_existing_namespace");
         return null;
       }
     }, NamespaceNotFoundException.class);
 
     // modify namespace descriptor for existing namespace
     NamespaceDescriptor ns1 = admin.getNamespaceDescriptor(prefix + "ns1");
     ns1.setConfiguration("foo", "bar");
     admin.modifyNamespace(ns1);
 
     // modify namespace descriptor for non-existing namespace
     runWithExpectedException(new Callable<Void>() {
       @Override
       public Void call() throws Exception {
         admin.modifyNamespace(NamespaceDescriptor.create("non_existing_namespace").build());
         return null;
       }
     }, NamespaceNotFoundException.class);
 
     // get table descriptors for existing namespace
     HTableDescriptor htd = new HTableDescriptor(TableName.valueOf(prefix + "ns1", "table1"));
     htd.addFamily(new HColumnDescriptor("family1"));
     admin.createTable(htd);
     HTableDescriptor[] htds = admin.listTableDescriptorsByNamespace(prefix + "ns1");
     assertNotNull("Should have not returned null", htds);
     assertEquals("Should have returned non-empty array", 1, htds.length);
 
     // get table descriptors for non-existing namespace
     runWithExpectedException(new Callable<Void>() {
       @Override
       public Void call() throws Exception {
         admin.listTableDescriptorsByNamespace("non_existing_namespace");
         return null;
       }
     }, NamespaceNotFoundException.class);
 
     // get table names for existing namespace
     TableName[] tableNames = admin.listTableNamesByNamespace(prefix + "ns1");
     assertNotNull("Should have not returned null", tableNames);
     assertEquals("Should have returned non-empty array", 1, tableNames.length);
 
     // get table names for non-existing namespace
     runWithExpectedException(new Callable<Void>() {
       @Override
       public Void call() throws Exception {
         admin.listTableNamesByNamespace("non_existing_namespace");
         return null;
       }
     }, NamespaceNotFoundException.class);
 
   }
 
   private static <V, E> void runWithExpectedException(Callable<V> callable, Class<E> exceptionClass) {
     try {
       callable.call();
     } catch(Exception ex) {
       Assert.assertEquals(exceptionClass, ex.getClass());
       return;
     }
     fail("Should have thrown exception " + exceptionClass);
   }
 
   @Test
   public void testValueOfNamespaceAndQualifier() {
     TableName name0 = TableName.valueOf("table");
     TableName name1 = TableName.valueOf("table", "table");
     assertEquals(NamespaceDescriptor.DEFAULT_NAMESPACE_NAME_STR, name0.getNamespaceAsString());
     assertEquals("table", name0.getQualifierAsString());
     assertEquals("table", name0.getNameAsString());
     assertEquals("table", name1.getNamespaceAsString());
     assertEquals("table", name1.getQualifierAsString());
     assertEquals("table:table", name1.getNameAsString());
   }
 
 }